package com.sky.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.fasterxml.jackson.databind.ser.Serializers;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        Long dishId = shoppingCartDTO.getDishId();
        Long setmealId = shoppingCartDTO.getSetmealId();
        String dishFlavor = shoppingCartDTO.getDishFlavor();
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        QueryWrapper<ShoppingCart> queryWrapper = new QueryWrapper<>();
        if(dishId != null){
            queryWrapper.eq("dish_id", dishId);
        }
        if(setmealId != null){
            queryWrapper.eq("setmeal_id", setmealId);
        }
        if(dishFlavor != null){
            queryWrapper.eq("dish_flavor", dishFlavor);
        }
        List<ShoppingCart> list = shoppingCartMapper.selectList(queryWrapper);

        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateById(cart);
        } else {
            if(dishId != null){
                Dish dish = dishMapper.selectById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                Setmeal setmeal = setmealMapper.selectById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        QueryWrapper<ShoppingCart> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("user_id", userId);
        return shoppingCartMapper.selectList(queryWrapper);
    }

    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        QueryWrapper<ShoppingCart> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("user_id", userId);
        shoppingCartMapper.delete(queryWrapper);
    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        // 获取用户id，查询当前登录用户的id
        shoppingCart.setId(BaseContext.getCurrentId());
        QueryWrapper<ShoppingCart> queryWrapper = new QueryWrapper<>();
        if(shoppingCart.getDishId() != null){
            queryWrapper.eq("dish_id", shoppingCart.getDishId());
        }
        if(shoppingCart.getSetmealId() != null){
            queryWrapper.eq("setmeal_id", shoppingCart.getSetmealId());
        }
        if(shoppingCart.getDishFlavor() != null){
            queryWrapper.eq("dish_flavor", shoppingCart.getDishFlavor());
        }
        if(shoppingCart.getUserId() != null){
            queryWrapper.eq("user_id", shoppingCart.getUserId());
        }

        List<ShoppingCart> list = shoppingCartMapper.selectList(queryWrapper);
        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart);
            } else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateById(shoppingCart);
            }
        }
    }
}
